Sea Otters (Enhydra lutris L.) of Bering Island, the Commander Islands: Age and Sex Composition...
Zagrebel'nyi, S.
2004-11-18 00:00:00
Animal censuses and assessment of mortality in the sea otter subpopulation of Bering Island (the Commander Islands) have shown that indices of seasonal mortality may be used as a criterion for estimating well-being of this animal group. In 1999, the subpopulation of Bering Island entered a phase of stabilization of its spatial, age, and sex structure, with the stabilization process proper taking approximately three years after a peak of mortality. Mortality in the course of this process proved to be relatively high in age groups older than eight years but insignificant among middle-aged reproductive animals. As the age and sex structure of the insular group varies during the year and in different coastal areas, the data obtained by collecting dead animals cannot be used for estimating the structure of the whole population.
http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.pngRussian Journal of EcologySpringer Journalshttp://www.deepdyve.com/lp/springer-journals/sea-otters-enhydra-lutris-l-of-bering-island-the-commander-islands-age-I0F2mEzCNC

Abstract

Animal censuses and assessment of mortality in the sea otter subpopulation of Bering Island (the Commander Islands) have shown that indices of seasonal mortality may be used as a criterion for estimating well-being of this animal group. In 1999, the subpopulation of Bering Island entered a phase of stabilization of its spatial, age, and sex structure, with the stabilization process proper taking approximately three years after a peak of mortality. Mortality in the course of this process proved to be relatively high in age groups older than eight years but insignificant among middle-aged reproductive animals. As the age and sex structure of the insular group varies during the year and in different coastal areas, the data obtained by collecting dead animals cannot be used for estimating the structure of the whole population.

Journal

Russian Journal of Ecology
– Springer Journals

Published: Nov 18, 2004

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References

Marine Mammals and the Exxon Valdez

Ballachey, B.E.; Bodkin, J.L.; De Gange, A.R.

Analysis of Vertebrate Populations

Caughley, G.

The Community Ecology of Sea Otters

Kvitek, R.G.; Oliver, J.S.

The Community Ecology of Sea Otters

Laur, D.R.; Ebeling, A.W.; Coon, D.A.

Morskie mlekopitayushchie: Mat-ly VI Vsesoyuz. soveshch

Mymrin, N.I.

The Commu-nity Ecology of Sea Otters

Riedman, M.L.; Estes, J.A.

Breeding Patterns and Reproductive Success of California Sea Otters

Riedman, M.L.; Estes, J.A.; Staedler, M.M.

Determining the Sex and Age of Sea Otters (Enhydra lutris) by the Canine Teeth

Ryazanov, D.A.; Maminov, M.K.

A Study of Mortality among Sea Otters (Enhydra lutris) on the Commander Islands in the Course of Population Monitoring

Ryazanov, D.A.; Vertyankin, V.V.; Nikulin, V.S.; Fomin, V.V.

The Commu-nity Ecology of Sea Otters

Van Blaricom, G. E.

Marine Mammal Strandings in the United States: Proceedings of the Second Marine Mammal Stranding Workshop